Two-revolution cylinder printing press



v Aug. 3, 1937; A. E. PEARSALL TWO-REVOLUTION CYLINDER PRINTING PRESSOriginal Filed Jan 14, 1936 2 Sheets-Shee' 1 /NvE/v ron ALBERT 'EzrwAR'aPEARSALL BY Wifi@ Aug. 3, 1937. A. E. PEARSALL TWO-REVOLUTION CYLINDERPRINTING PRESSV 2 Sheets-Sheet 2 5 4 6 7 i .(.l w am Am Il N 5 n?. 5 l 3l I I m Q\. A M .M \\m A I l I I l I I l l l I I l I l l l l l I I m l\\3 w m 1 m w f HM \l 3 uw dj@ Q w HH. ,HMHAQ 7., i H... www?? l IH.,iwf@ ,z e VW W 5 3 mm m QL ,L

ATTORNEY Patented Aug. 3, 1937 PATENT OFFICE TWO-REVOLUTION CYLINDERPRINTING PRESS i Albert Edward Pearsall, Vancouver, British Cou lumbia,Canada Application January 14, 1936, Serial No. 59,052 Renewed June 16,1937 4 Claims.

My invention relates to improvements in tworevolution cylinder printingpresses, the objects of which are to providemeans whereby multiple.colour p-rinting can be done on said presses at 5` a single operation,whereby the registration of the several colours is assured on allprinting done and whereby great economy of equipment and time isobtained.

` 1 The present method doing multiple colour work on presses cf thesingle cylinder and reciprocating bed type is to print a run of onecolour and subsequently to put the printed sheets through the press asecond and third time, giving successive impressions of diiferentcolours. The major f difculty in such a case lies in the accurateregistration of the paper in successive runs through the press.

The present invention contemplates the use of one or more form cylinderstimed with the bed and the impression cylinder so that as a sheet ofpaper is printed by the form on the bed it is passed between the formcylinders and the-impression cylinder to receive further imprints, aswill be more fully described in the following specification and shown inthe accompanying drawings, in

which:-

Fig. 1 is a side elevation of the invention applied to the frame of atwo revolution cylinder press.

Fig. 2 is a plan View of same.

In the drawings like characters of reference indicate correspondingparts in each figure.

The numerals I and 2 indicate side frame members of a press, betweenwhich a bed 3 is slidably movable. The numeral 4 indicates theimpression cylinder which is journalled at opposite ends in eccentrics5. i The eccentrics 5 are each provided with an arm 3 which is connectedthrough a connecting rod I `d10 to a crank 8 secured upon a shaft 9.

. The parts thus far described are usual parts in the standard tworevolution cylinder press and are operated from' the regular drive ofthe press.

The cranks 8 on being rocked in a downward 45 direction rock theeccentrics 5 and move the impression` cylinder 4, which `has picked up asheet of paper, in a downward direction until the paper is brought intocontact with the form, not shown, upon the bed 3. After impression andduring 50 the second revolution of the impression cylinder the cranks 8are raised and the cylinder is in consequence held out of contact withthe bed. This operation is regularly carried out in presses of the tworevolution cylinder type and is therefore 55 deemed to require nofurther description.

(Cl. lOl- 173) Pivotally mounted upon the side frame members I and 2 isa form cylinder assembly generally indicated by the numeral I0, whichconsists of a pair of brackets II which are rockingly mounted upon pinsI2 extending from the frame members. Each of the brackets II is providedwith a rear abutment I3 and a front extension I4, the front extension I4 being engaged by a horizontally disposed spring I5 carried by a framemember and also by a vertical spring I3 carried from the frame member bya step Il. Each bracket II includes a bearing I8 for a form cylinder I9and slotted bearings 20 and 2l for ink rollers 22 and 23 respectively.The bearings 2I are provided with a suitable keeper 24 for holding theshaft 25 of the ink rollers 23 against displacement.

To each of the brackets. II similar brackets 26 are pivotally connectedas at 2l. These brackets form part of another form cylinder assemblygenerally indicated by the. numeral IA which includes a form cylinderI9, slotted bearings 2IJ and 2I and ink rollers 22 and 23. The brackets26 are similarly provided with a rear abutment I3 and a front extensionI4 which latter is engaged by springs I5 and I6 in an exactly similarmanner to the elements of the brackets. I I.

The free end of each of the eccentric arms 6 is provided with a camplate 28 adapted to engage a swinging lever 29 which is journalled fromthe side frame members I or 2. This swinging lever is provided with apair of projections 39 which engage a roller 3| projecting inwardly fromeach of the abutments i3 of the brackets II and 29, so that as theeccentric arms 3 are swung upwardly to raise the impression cylinder lofi impression the form cylinders I9 and their ink rollers 22 and 23 aremoved away from the impression cylinder, converselyas the eccentric armsare lowered and the impression cylinder 4 is lowered into impressionposition upon the bed the form cylinders are moved by the springs I5 and`I6 into printing Contact with the paper upon the impression cylinder.

The impression cylinder ii is fitted upon a shaft 32 having a gear 33driven from the main drive of the. press, not shown. The shaft 32 istted with a drive gear 34 which meshes with a gear 35 secured to each ofthe shafts 3B of the form cylinders I9 to drive them at the sameperipheral speed as the impression cylinder 4.

The ink rollers 22 are driven by gears 31 tted to the end of each of theform cylinders I9 which gears mesh with gears 38 tted to the shafts` 39of the ink rollers.

The gear wheels 35 are tted on their inner side with a cam which engagesand rocksV an arm V4I mounted upon a suitable supporting member, thisarm being forked at its forward end to engage a slotted collar 42secured to the shaft 43 of the ink roller 23. A spring 44 is interposedon each shaft 43 between the bracket II and the adjacent end of the inkroller 23 for the purpose of urging said ink roller axially in onedirection and the cam 40 serves through the arm 4I to move said rollerin the opposite direction.

Suitably supported between the frame members I `and 2 are inkingfountain assemblies 45, one to each form cylinder assembly. Eachassembly consists of a fountain 46 ofV the usual type with a fountainroller 41. Between the roller 41 and the inkV roller 23 is a'ductorroller 48. The ductor rollers 48 are mounted uponY shafts 49 and arecarried in forked arms 50 which are pivotally mounted upon the framemembers I and 2. These arms are mounted upon a transverse shaft 5I towhich is secured a lever 52, the free end of Vthe lever is engaged by acam 53 formed upon the lower end of the crank 8, so that as the crank 8is rocked to bring the impression cylinder onto impression position thearms/ 50 Vare swung to bring the ductor roller 48 into inking contactwith the roller 23.

The forked arms 50 are spring tensioned as at 54 to move them and theductor rollers towards the ink fountains. 46. The fountain rollers 41are each fitted with a ratchet wheel 55 which is adapted to be engagedby a pawl 56, so that each time the ductor rollers move towards' theirrespective fountain rollers 41 the latter are turned about their axes toreceive a further supply of ink.

In operation, forms for the first colour are secured to the bed 3 of thepress, forms for the second colour are secured in proper registration onthe lower form cylinder I9 and forms for the third colour, if threecolour printing is tobe done, is secured to the upper form cylinder I9.When the forms are in registration and the ink fountains supplied withink of the desired colour, the press is set in motion and is fed withsheets of papers in the usual way. Each sheet on being gripped andcarried around upon the surface of the impression cylinder 4 is firstbrought into impression upon the forms on the bed 3 as the bed moves tothe right, see Figure 1, or to the front of the press, it then passesinto impression on the forms of each of the lower and upper formcylinders I 9. As the bed is about to return, the eccentric arms 6 areraised to take the form cylinder ofi impression and simultaneously theswinging levers 29 are thrust forwardly by the cam plate 28, thusswinging the vform roller assemblies I0 and I 0A away from theimpression cylinder 4 and the ductor rollers 48 are drawn out of contactwith the rollers 23 and moved into contact with the fountain rollers 41.During the time that the impression cylinder 4 takes its secondrevolution it discharges the printed sheet and picks up an unprintedone. Y v What I claim as my invention is:

1. The combination with a two revolution impression cylinder presshaving frame members, an impression cylinder mounted in eccentricswhereby the movement of the eccentrics moves the l being adapted forcoordinate movement into and out of printing engagement with theimpression v.cylinder with the rst mentioned form cylinder. e 2. Thecombination with a two revolution impression cylinder press having framemembers, an impression cylinder mounted in eccentrics wherebythemovement of the eccentrics moves the impression cylinder towards or awayfrom a reciprocating bed, a pair of brackets swingingly mounted on theframe members, a form cylinder journalled in said brackets, means forswinging the brackets to move the form cylinder into printing engagementWith the impression cylinder, and means operated in response to theeccentric movement 4for rocking the brackets and the form cylinder awayfrom the impression cylinder, an ink roller carried by said bracketsadapted to contact the form upon the form cylinder, a stationary inkfountain and a ductor roller adapted to transfer ink from the fountainto the ink roller as the brackets and the form cylinder are rocked awayfrom the impression cylinder.

3. The combination with a two revolution impression cylinder presshaving frame members, an impression cylinder mounted in eccentrics formovement towards and away from a reciprocating bed as the eccentrics arerocked, a form cylinder rockingly mounted in brackets parallel to theimpression cylinder, a cam plate associated with the eccentrics, aswinging arm adapted to be actuated bythe cam plate to rock the bracketsand move the form cylinder away from the impression cylinder in timedrelation with the movement of the impression cylinder towards and awayfrom the bed, spring means for moving the form cylinder towards theimpression cylinder and means for applying ink to the form cylinder. I4. The combination with a two revolution impression cylinder presshaving frame members,l

an impression cylinder mounted in eccentrics whereby the movement of theeccentrics moves the impression cylinder towards or away from areciprocating bed, a pair of brackets swingingly mounted on the framemembers, a form cylinder journalled in said brackets, means for swinging

